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execsOverLimit-Resolution Guideが原因で、ONTAP 遅延が少ない低速のNFSクライアント

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Category:
ontap-9
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perf
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環境

  • ONTAP 9
  • NFSv3
  • NFSv4.x
  • 実行コンテキスト(ONTAPの未処理のNFS IOの制限)

問題

  • NFS クライアントのピーク負荷時に高いレイテンシまたはスループットの急激な低下が観察されます。
  • Oracle DBで、DBコミットの待ち時間が長くなると報告される。
  • CLI や監視ツールを使用したストレージコントローラの CPU / メモリ / ディスクのボトルネックには起因できません。
  • ONTAP 9.8 以降では、次のようなイベントログエラーメッセージが表示されます。
Fri Jan 01 01:47:19 +0100 [NETAPP03: kernel: nblade.execsOverLimit:error]: The number of in-flight requests from client with source IP 10.20.30.40 to destination LIF 10.20.30.50 (Vserver 7) is greater than the maximum number of in-flight requests allowed (128). The client might see degraded performance due to request throttling.

 

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